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Posted by / 20-May-2020 09:41

Oracle updating chunks big table

Visit Stack Exchange Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Sign up to join this community update hslak set HSLAKSTS = reverseheb(hslaksts) , HSLAKSBSTS=reversehebchars(hslaksbsts), HSLAKIVTK=reverseheb(HSLAKIVTK), HSLAKMKOR=reverseheb(HSLAKMKOR), HSLAKIRGTG=reverseheb(HSLAKIRGTG), HSLAKMCR= reverseheb(HSLAKMCR), HSLAKMASL=reverseheb(HSLAKMASL); it run for 6-7 hours and it is not over yet.

Would it be faster to create a new table rather then update it?

Would it be better to create a loop and update 100000 records each time and commit after each iteration?

Is the process I/O bound (there is lots of disk activity) or CPU bound (which is possible if the functions are complex)?

If you and your users can cope with the data being partially updated at any given time then this (probably with a smaller number of rows then 100,000) gives you the advantage of not blocking your application for other uses as you don't have an update lock on the entire table for the length of time it takes to update all the rows.

I've not used postgres much but assuming it behaves similarly to MS SQL Server (in simple recovery mode) using smaller updates inside explicit transactions can greatly reduce the amount of log file growth but is unlikely to significantly affect overall run-time.

It is most likely the former and if so then if there are indexes covering those columns it is usually better to drop them before operations that update every row and recreate them afterwards (don't drop the PK and/or clustered index though).

This should be safe to do as long as you don't stop the SQL Agent job. By sending the process a "signal" (similar to in Unix), you can request that it stop at the next convenient moment (i.e. ) and have it clean itself up all nice and tidy-like.I mean, for instance, is called 6 times for each row which involves 6 context switches SQL/PLSQL .Is it possible to rewrite the function so it can be called just once ?The Oracle UPDATE statement is used to update existing records in a table in an Oracle database.There are 2 syntaxes for an update query in Oracle depending on whether you are performing a traditional update or updating one table with data from another table.

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